Cast Steel Trunnion Mounted Ball Valves Description
Cast steel trunnion ball valve is a fixed ball valve. Its ball is fixed to the center of the valve body by the upper and lower shafts. Under the medium pressure, the floating valve seat moves and presses the ball to achieve two-way sealing. It is specially designed for high-pressure, large-diameter and long-distance pipelines.
Main structure
Valve body and ball:
The valve body is made of cast steel (WCB), stainless steel (304/316L) or forged steel, and the surface of the ball is hard alloy surfacing to enhance wear resistance.
The trunnion (upper and lower shafts) fix the ball to avoid ball displacement and reduce operating torque.
Seal assembly:
Floating valve seat: Driven by the medium pressure, the ball is pressed to form a self-tightening seal, which supports two-way sealing.
Fireproof design: In the event of a fire, the valve seat retainer and the valve body form a metal seal (in accordance with API 607 standard).
Cast Steel Trunnion Mounted Ball Valves specification
Body Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel, etc.
Bolted Bonnet and Split Body, Fixed Ball inside
Blow-out Proof Stem and Fire-safe Design
Low Emission Packing and Anti-Static Design
Soft Sealing or Hard Sealing as per Customer's Request
Full Port or Reduced Port Design
Size Range: NPS 2" ~ 40" ; DN50 ~ DN1000
Pressure Rating: Class 150 ~ Class 1500 ; PN16 ~ PN100
End Type: RF, FF, RTJ, BW
Mode of Operation: Worm Gear, Wrench Nut, Electric, Pneumatic, etc.
Cast Steel Trunnion Mounted Ball Valves
Applications
Petrochemical industry: High-pressure crude oil/natural gas pipeline cutoff and reactor medium control. Long-distance pipeline: Large-diameter (DN600+) water and gas transmission projects, suitable for Class 600 and above high-pressure environments. Industrial equipment: Boiler steam pipelines, particle-containing slurry transportation.
Advantages
Reliable sealing: Bidirectional sealing design, leakage rate ≤0.01mL/min. Long life: The opening and closing life of the hard seal structure exceeds 100,000 times, and the replacement cycle of the soft seal is 3~5 years. Flexible installation: No flow direction restrictions, can be installed horizontally or vertically
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